This vent cover functions as a return air vent grille, designed for optimal airflow, increasing the efficiency of HVAC systems, and it helps maintain air pressure and improve air quality by filtering out debris. Suitable for residential and commercial heating, ventilation, and air conditioning systems. It is best suited for temperatures ranging from -4 °F to 176 °F.Specification:Material: ABS PlasticInner Size: 685 x 190mm / 27 x 7.5 inch (L*W)Outer Size: 735 x 240 x 35mm/ 29 x 9.4 x 1.4 inch (L*W*H)Applicable Duct Opening Size: 700 x 200mm / 28 x 8 inch (L*W)Packing Listing: 1 x Ventilation GrilleAdvantage:Made of ABS plastic, smooth surface, temperature-resistant, sturdy, durable, and not easy to color-fade.
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